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Medium 5.5Published Jul 20, 2021
CVE-2021-33910basic/unit-name.c in systemd prior to 246.15, 247.8, 248.5, and 249.1 has a Memory Allocation with an Excessive Size Value (involving strdupa and alloca for a pathname controlled by a local attacker)…
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It affects Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP and 7 other products. Add what you run to find out whether that includes you.
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basic/unit-name.c in systemd prior to 246.15, 247.8, 248.5, and 249.1 has a Memory Allocation with an Excessive Size Value (involving strdupa and alloca for a pathname controlled by a local attacker) that results in an operating system crash.
- CVSS
- 5.5 MEDIUM (v3.1, CISA ADP)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- Weakness (CWE)
- CWE-770
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- mitre
- NVD analysis
- Modified
- Record last updated
- Oct 14, 2026
- First seen by InfoSec Signals
- Oct 14, 2026
Affected products
Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP siemens:simatic_s7_1500_cpu_1518_4_pn_dp_mfp (from the name) | from V3.1.0 before V3.1.5 | CISA ADP |
Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP siemens:simatic_s7_1500_cpu_1518f_4_pn_dp_mfp (from the name) | from V3.1.0 before V3.1.5 | CISA ADP |
Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP siemens:siplus_s7_1500_cpu_1518_4_pn_dp_mfp (from the name) | from V3.1.0 before V3.1.5 | CISA ADP |
systemd_project systemd systemd_project:systemd | before 246.15; from 247 before 247.8; from 248 before 248.5; from 249 before 249.1 | NVD |
fedoraproject fedora fedoraproject:fedora | 33; 34 | NVD |
debian debian_linux debian:debian_linux | 10.0 | NVD |
netapp hci_management_node netapp:hci_management_node | all versions | NVD |
netapp solidfire netapp:solidfire | all versions | NVD |
References
- https://github.com/systemd/systemd/pull/20256/commits/441e0115646d54f080e5c3bb0ba477c892861ab9x-refsource-misc, patch, third-party-advisory
- https://www.openwall.com/lists/oss-security/2021/07/20/2x-refsource-misc, exploit, mailing-list, third-party-advisory
- https://security.gentoo.org/glsa/202107-48vendor-advisory, x-refsource-gentoo, third-party-advisory
- https://www.debian.org/security/2021/dsa-4942vendor-advisory, x-refsource-debian, third-party-advisory
- http://packetstormsecurity.com/files/163621/Sequoia-A-Deep-Root-In-Linuxs-Filesystem-Layer.htmlx-refsource-misc, exploit, third-party-advisory, vdb-entry
- https://github.com/systemd/systemd/commit/b34a4f0e6729de292cb3b0c03c1d48f246ad896bx-refsource-misc, patch, third-party-advisory
- https://github.com/systemd/systemd-stable/commit/cfd14c65374027b34dbbc4f0551456c5dc2d1f61x-refsource-misc, patch, third-party-advisory
- https://github.com/systemd/systemd-stable/commit/b00674347337b7531c92fdb65590ab253bb57538x-refsource-misc, patch, third-party-advisory
- https://github.com/systemd/systemd-stable/commit/4a1c5f34bd3e1daed4490e9d97918e504d19733bx-refsource-misc, patch, third-party-advisory
- https://github.com/systemd/systemd-stable/commit/764b74113e36ac5219a4b82a05f311b5a92136cex-refsource-misc, patch, third-party-advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/2LSDMHAKI4LGFOCSPXNVVSEWQFAVFWR7/vendor-advisory, x-refsource-fedora
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/42TMJVNYRY65B4QCJICBYOEIVZV3KUYI/vendor-advisory, x-refsource-fedora
- http://www.openwall.com/lists/oss-security/2021/08/04/2mailing-list, x-refsource-mlist, patch, third-party-advisory
- http://www.openwall.com/lists/oss-security/2021/08/17/3mailing-list, x-refsource-mlist, patch, third-party-advisory
- http://www.openwall.com/lists/oss-security/2021/09/07/3mailing-list, x-refsource-mlist, patch, third-party-advisory
- https://security.netapp.com/advisory/ntap-20211104-0008/x-refsource-confirm, third-party-advisory
- https://cert-portal.siemens.com/productcert/pdf/ssa-222547.pdfx-refsource-confirm
- https://cert-portal.siemens.com/productcert/html/ssa-222547.html
- https://cert-portal.siemens.com/productcert/html/ssa-398330.html
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.